/Engine/Source/Runtime/SlateCore/Public/Widgets/SBoxPanel.h
A BoxPanel contains one child and describes how that child should be arranged on the screen.
class SBoxPanel : public [SPanel](API\Runtime\SlateCore\Widgets\SPanel)
TPanelChildren<...
Children
The Box Panel's children.
EOrientation
Orientation
The Box Panel's orientation; determined at construct time.